WO2009010458A2 - Dispositif et procédé de test d'un joint d'étanchéité prévu pour des applications à basse température - Google Patents

Dispositif et procédé de test d'un joint d'étanchéité prévu pour des applications à basse température Download PDF

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Publication number
WO2009010458A2
WO2009010458A2 PCT/EP2008/059063 EP2008059063W WO2009010458A2 WO 2009010458 A2 WO2009010458 A2 WO 2009010458A2 EP 2008059063 W EP2008059063 W EP 2008059063W WO 2009010458 A2 WO2009010458 A2 WO 2009010458A2
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WO
WIPO (PCT)
Prior art keywords
receiving
test
seal
space
receiving device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2008/059063
Other languages
German (de)
English (en)
Other versions
WO2009010458A3 (fr
Inventor
Dmitry Suslov
Dirk Greuel
Oskar Haidn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsches Zentrum fuer Luft und Raumfahrt eV
Original Assignee
Deutsches Zentrum fuer Luft und Raumfahrt eV
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Filing date
Publication date
Application filed by Deutsches Zentrum fuer Luft und Raumfahrt eV filed Critical Deutsches Zentrum fuer Luft und Raumfahrt eV
Publication of WO2009010458A2 publication Critical patent/WO2009010458A2/fr
Publication of WO2009010458A3 publication Critical patent/WO2009010458A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2853—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals
    • G01M3/2869—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals for seals not incorporated in a pipe joint
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/223—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for pipe joints or seals

Definitions

  • the present invention relates to a testing device for testing a seal provided for a low-temperature application.
  • Gaskets for cryogenic applications are used, for example, in devices that serve to store and / or combust materials that may be present, especially in liquid form and at a temperature well below zero.
  • Such substances for example oxygen or hydrogen, are also referred to as cryomedia.
  • cryomedia For a safe handling of these cryomedias, it is very important that the seals provided for a low temperature application are particularly reliable. It is therefore necessary after the preparation of such a seal to check these in terms of their function. However, such a test should be accompanied by the least possible time and expense so that it is suitable for mass production of a wide variety of batch sizes.
  • the present invention has for its object to provide a test apparatus of the type mentioned, which allows a reliable and economic testing of a planned for a low-temperature application seal.
  • the testing device enables a simple and reliable testing of a seal provided for a low-temperature application.
  • the seal to be tested can be arranged in the receiving space of the receiving device and the receiving space can be supplied with test fluid.
  • the receiving device With the aid of the cooling device, the receiving device can be cooled, so that the verification of the function of the seal to be tested can be carried out in a specific temperature window. This may correspond to the temperature window when using the tested seal.
  • the test device according to the invention has the advantage that cooling does not have to take place with the aid of the test fluid itself, but with the aid of the cooling can be made. As a result, the apparatus required to provide the strigffuids can be kept to a small extent.
  • Kühieinr ⁇ chtung known chillers can be used, which allows cooling of the receiving device even at very low temperatures in an economical manner.
  • the test device according to the invention makes it possible to heat only a spatially limited part of the test device, namely the receiving device, to a low temperature in order to be able to create realistic test conditions.
  • the remaining parts and areas of the test apparatus can be below ambient temperature, which significantly improves the operation of the test apparatus as compared to cooling the entire test apparatus. This simplifies in particular the effort to provide the test fluid.
  • the testing device comprises a measuring device in fluid-effective connection with the receiving space for determining a volume and / or a volumetric flow and / or a mass and / or a mass flow of a leakage quantity of the test fluid.
  • the measuring device makes it possible to determine characteristic quantities of a leakage quantity of the test fluid. For the sizes mentioned, setpoints can be specified, beyond which a seal to be tested should be considered no longer functional.
  • As a measuring device for example, flow meters (“Fiow meter”) or helium leak testers can be used.
  • test an axial seal via the test device according to the invention.
  • sealing surfaces (contact surfaces) of the seal are transverse and in particular perpendicular to a major axis of the seal.
  • Such seals are often under application of an axial force (a Force parallel to the main axis) in one application.
  • the test device according to the invention makes it possible to exert such an axial force on the seal during the test as the seal to be tested experiences an application.
  • seals for cryogenic applications are formed with an exclusively metallic base body, which does not allow a radial deformability or at most to a very small extent.
  • testing device it is possible to test the tightness of a seal under cryogenic conditions without relative movement taking place between the seal and corresponding elements of the testing device.
  • Such mobility results in frictional forces that could mechanically damage a particularly coated metallic gasket for cryogenic applications.
  • the cooling device is designed for cooling the receiving device to a temperature of at most about -12O 0 C. This is particularly advantageous for seals to be tested, which are exposed to a maximum temperature of about -120 0 C during their use.
  • the cooling device can also allow the cooling of the receptacle to lower temperatures than -120 0 C, for example to a temperature of a maximum of about -200 0 C and in particular up to a temperature near absolute zero, for example up to -27O 0 C.
  • the cooling device comprises a container for holding ademedtums. The container allows the storage of a cooling medium, which can be supplied to the receiving device.
  • Said container can also make it possible to arrange the receiving device at least in sections within the container of the cooling device.
  • the container of the cooling device is thermally insulated, for example by the container having a multi-wall construction.
  • the receiving device can be positioned in direct contact with a cooling medium. This allows a direct release of heat from the receiving device into the cooling medium.
  • the cooling medium is liquid. This allows a particularly good, the receiving device at least partially enclosing contact of the cooling medium with the receiving device.
  • the cooling medium comprises hay and / or nitrogen. These cooling media enable a simple, economical and safe cooling of the receiving device.
  • the receiving device is arranged in a container of the cooling device and at least partially immersed in a particular liquid cooling medium, which is arranged in the container of the cooling device.
  • the test device comprises a temperature measuring device for measuring the temperature of the receiving device and / or the seal to be tested and / or the test fluid.
  • the temperature measuring device makes it possible to determine, at the soft temperature, the receiving device and / or the seal and / or the test fluid by means of the cooling device was cooled. This has the advantage that the actual test of the seal can be initiated only at a time when the temperature measuring device indicates a suitable temperature range.
  • This temperature range preferably corresponds to a temperature range to which the seal to be tested is exposed during its subsequent use.
  • the supply device is arranged away from a spatial effective range of the cooling device.
  • the supply device may in particular be arranged in an area which is below ambient temperature, for example approximately 20 ° C.
  • the supply device itself can be designed conventionally, ie for conventional temperature windows in the range of, for example, above 0 ° C.
  • conventional, inexpensive supply devices can be used, which may have comparatively simply constructed valves and valves.
  • the receiving device prefferably has an inlet, which is in efficient contact with the receiving space, for introducing the test fluid into the receiving device.
  • an inlet permits a defined introduction of the test fluid into the receiving space of the receiving device.
  • the inlet and the supply device are connected to one another via a supply line.
  • a supply line This enables a simple transport of the test fluid from the supply device to the receiving device.
  • the supply line also makes it possible in a particularly simple manner to be able to arrange the supply device outside a spatial effective range of the cooling device.
  • the supply line may have a corresponding length, which may in particular be several meters, for example more than 3 m.
  • the receiving device has an outlet for discharging, which is in fluid-effective connection with the receiving space a leakage amount of the test fluid from the receiving device. This has the advantage that a leakage quantity of the test fluid can be removed in a defined manner from the receiving space of the receiving device.
  • the receiving space of the receiving device is arranged between the inlet and the outlet in the direction of flow of the test fluid.
  • the receiving space may in particular be arranged spatially between the inlet and the outlet.
  • outlet of the receiving device and the measuring device are connected to one another via a leakage line line. This allows a simple transport of a leakage amount of the test fluid from the receiving device to the measuring device.
  • the measuring device is arranged away from a spatial effective range of the cooling device. This can be achieved for example by a corresponding length of the aforementioned leakage line line, which is for example at least about 3 m.
  • the arrangement of the measuring device outside the spatial effective range of the cooling device allows the use of conventional measuring devices known per se for determining a characteristic size of a leakage quantity of the test fluid.
  • the measuring devices can be operated in a temperature range far above a low-temperature window, for example at a temperature of> 0 0 C and in particular at an ambient temperature of about 2O 0 C.
  • the receiving device comprises a storage space in fluid-active connection with the receiving space for storing a test fluid which can be introduced into the receiving device.
  • the storage space makes it possible to temporarily store the test fluid so that it can assume the temperature of the receiving device which has been cooled with the aid of the cooling device.
  • the storage space allows the test fluid to be supplied to the receiving space in a defined manner.
  • the storage space may be essentially annular or cylindrical and may be arranged concentrically with respect to an annular receiving space. In this way, the test fluid along the circumference of an annular seal to be tested can be brought to the seal.
  • a further preferred embodiment of the invention provides that the receiving device comprises a collection space in fluid-effective connection with the receiving space for collecting a dischargeable from the receiving device leakage amount of scholarfiuids.
  • the collecting space makes it possible to absorb even very small leakage quantities of the test fluid in order to be able to supply this leakage quantity, for example, to a measuring device.
  • the collecting space likewise has an annular shape and is arranged concentrically with respect to the receiving space. In this way, according to the size of the seal to be tested, test fluid can flow out of the receiving space into the collecting space. With the help of the collecting space adjacent to the receiving space, even a very small amount of leakage of the test fluid can be stored.
  • the receiving space is arranged between the storage space and the collecting space.
  • Such an arrangement is achieved in particular if the receiving space, the storage space and the collecting space are cylindrical or annular and the receiving space, the storage space and the Collecting space coaxially and / or concentrically arranged. This arrangement allows a particularly compact construction of the receiving device. As a result, the cost of cooling the receiving device is minimized.
  • the receiving device comprises a first receiving part and a second receiving part, between which the seal to be tested can be positioned and an axial force can be exerted on the seal to be tested by means of a force-applying device.
  • the axial force is preferably achieved by relative movement of the first receiving part to the secondracte ⁇ l.
  • the first receiving part has a corresponding receiving space for the seal to be tested, wherein an axial force can be exerted on the seated in the corresponding receiving space to be tested seal on the second receiving part. It can thereby act during the test a seal to be tested with an axial force, which experiences the seal even in an application. This allows the seal to be tested with the conditions prevailing in an application.
  • the applied axial force is adjustable via the force application device. This makes it possible to adapt the test conditions to the conditions of use for the seal to be tested.
  • sealing surfaces of the seal to be tested on the firsttectei! and second receiving part there are sealing surfaces of the seal to be tested on the firsttectei! and second receiving part.
  • sealing surfaces lie opposite each other. It can thereby adjust an axial force on the seal to be tested in a simple manner via the first receiving part and the second receiving part by a relative movement with appropriate application of force.
  • the receiving device comprises at least two detachably connectable meloditeiie.
  • the dimensions of the receiving parts can increase the dimensions of the receiving space by a large amount. times exceed, so that a particularly torsionally rigid receiving device can be created, which, as explained below, is also suitable for exposure to under a very high pressure fürfiuid.
  • the receiving parts define a parting plane which extends through the receiving space and / or the receiving space limiting.
  • the dividing plane also runs through the storage space and / or the collecting space and / or delimits the storage space and / or the collecting space.
  • a further embodiment of the invention provides that the receiving parts are sealed relative to each other with the aid of a sealing device.
  • the receiving parts can be sealed relative to one another, for example in order to prevent the penetration of cooling medium into the receiving device.
  • the additional sealing device can meet lower requirements compared to a seal to be tested and be formed for example of a relatively soft metallic material, such as copper, or of a synthetic material, such as polytetrafluoroethylene (PTFE).
  • the sealing device seals a collecting space for collecting a leakage quantity of the test fluid which can be discharged from the receiving device with respect to an environment of the receiving device. In this way, an undesired escape of a leakage quantity of the test fluid from the collecting space into the surroundings of the receiving device can be prevented. This ensures that the velvet leakage amount of the test fluid of a measuring device for determining characteristic quantities can be supplied.
  • test fluid can be pressurized with an overpressure. This allows the seal to be tested a
  • Test fluid to be suspended which is subjected to overpressure.
  • the seal to be tested can be tested under pressure conditions that correspond to later operating conditions.
  • test fluid can be subjected to a negative pressure. This is particularly advantageous for seals to be tested, which are exposed to a negative pressure during their later use.
  • the supply device comprises a pressurizing device for acting on the test fluid with a test pressure.
  • a decisive for the testing of a seal size can be specified.
  • test results can be directly compared with one another if the test pressure for successive measurements corresponds in each case to a predetermined test pressure.
  • the test pressure is at least about 200 bar.
  • the test pressure may in particular be at least approximately 600 bar, for example approximately 1000 bar.
  • a seal can be tested in a pressure range that can exceed the pressure range in the later use of the seal by a multiple. Due to the very high test pressures, it is also possible to increase a leakage quantity of the test fluid, so that characteristic quantities of this leakage quantity (for example volume and / or volume flow under the mass and / or mass flow) can be determined more easily and with a higher resolution.
  • An embodiment of the invention provides that the test fluid is helium. Helium has the advantage that it does not react as noble gas with other substances.
  • test fluid is hydrogen. This has the advantage that a particularly realistic test of a seal is made possible, which is in contact with hydrogen in its later use.
  • the invention further relates to a method for testing a seal provided for a tie-dye application.
  • the invention is based on the further object of improving a method of the type mentioned in such a way that a reliable and economical testing of a seal provided for a low-temperature application is made possible.
  • a seal to be tested in a receiving space of a receiving device is arranged, that the receiving device is cooled, that the receiving space a strigfiuid is supplied, and that a volume and / or a volume flow and / or a mass and / or a mass flow of a discharged from the receiving device leakage amount of the test fluid is determined.
  • the connection of the receiving parts with each other can be designed so that the seal to be tested is elastically deformed and exposed to a predetermined pressure load. This deformation and / or this pressure load can or can approximate the later conditions of use of the seal to be tested or correspond to it in an advantageous manner exactly.
  • a test pressure of the test fluid is kept constant during the determination of a volume and / or a volumetric flow and / or a mass flow and / or a mass flow of a leakage quantity of the test fluid discharged from the receiving device. This allows the seal to be tested to be subjected to a constant test pressure and the determination of characteristic quantities of a leakage quantity of the test fluid.
  • This test method can be used to create particularly repeatable test conditions that allow a good comparability of the test results obtained during the testing of different seals.
  • the invention further relates to the use of an above-described test apparatus for carrying out a method explained above.
  • test device according to the invention and the test method according to the invention are particularly suitable for seals used in space technology, in production plants, in storage and / or transport systems for industrial gases or in the manufacture of valves, in particular shut-off valves, as well as in the automotive industry, especially in the field hydrogen fueling system and fuel cell supply systems. Further features and advantages of the invention are the subject of the following description and the drawings of preferred embodiments.
  • Figure 1 is a schematic view of an embodiment of a test device according to the invention with a receiving device
  • FIG. 2 shows a sectional side view of the receiving device according to FIG. 1 according to a first embodiment
  • FIG. 3 shows a view corresponding to FIG. 2 of a receiving device according to a second embodiment.
  • a test device is designated by 10 in FIG. 1 and comprises a supply device 12 with the aid of which a test fluid, in particular helium or hydrogen, is provided.
  • the supply device 12 is connected via a supply line 14 to an inlet 16 of a receiving device 18. With the aid of the supply line 14 of the receiving device 18, said test fluid can be supplied.
  • the receiving device 18 has an outlet 20 which is connected to a leakage quantity line 22. This opens at a measuring device 24, with which a volume and / or a volume flow and / or a mass and / or a mass flow of a discharged from the receiving device 18 leakage amount of the test fluid can be determined.
  • the test apparatus 10 further comprises a cooling device, generally designated 26. This has a container 28 in which a liquid cooling medium 30, in particular helium and / or nitrogen is arranged.
  • the receiving device 18 is in direct contact with the cooling medium 30 and is completely immersed in the cooling medium 30.
  • the test apparatus 10 also has a temperature measuring device 32, with which the temperature of the receiving device 18 can be measured.
  • the receiving device 18 and the cooling device 26 are shown in Figure 2 in a higher degree of detail.
  • the container 28 of the cooling device 26 has a substantially circular disk-shaped bottom 34, to which a substantially cylindrical side wall 36 connects.
  • the bottom 34 and the side wall 36 delimit a cylindrical container interior 38, in which the cooling medium 30 is arranged.
  • the container 28 may be arranged for its thermal insulation in a further, not shown in the drawing, outer container. Between the wall parts of this outer container and the container 28, an additional insulating layer, for example in the form of a vacuum, may be provided.
  • the receiving device 18 is formed substantially cylindrical overall.
  • the receiving device 18 has a cylindrical, first, lower receiving part 40 and a cylindrical, second, upper receiving part 42.
  • the receiving halls 40 and 42 are connected to each other by means of a plurality of connecting devices 46.
  • the connecting devices 46 extend parallel to a central axis 58 of the receiving device 18.
  • the connecting devices 46 are arranged in a radially outer region of the receiving device 18. For example, a total of twelve connecting devices 46 can be provided, which are each spaced at an angle of 30 ° relative to each other.
  • Each linkage 46 includes a bore 48 provided in the first receptacle SI 40 which engages with a bore 48 in the second receptacle. 42 forward seen bore 50 is aligned.
  • the bores 48 and 50 extend in a planar manner to the central axis 58 of the receiving device 18.
  • the bores 48 and 50 are penetrated by a threaded section 52 which opens at an upper screw head 54 in FIG. With its lower end, the threaded portion 52 projects beyond the first receiving part 40 and engages in a nut 56.
  • the first receiving part 40 can be pressed against the second receiving part 42 via a Kraftbeetzungseänraum 57.
  • a gasket to be tested which is arranged between the first receiving part 40 and the second receiving part 42 and, as it were, clamped therebetween, exerts an axial force.
  • the application of force is adjustable, so that the axial force is adjustable.
  • the axial force can be "simulated" on an axial seal for use in testing the seal.
  • the force application device 57 is formed by the connection devices 46.
  • the receiving part 40 and the receiving part 42 face each other.
  • a parting plane 44 is indicated. If a seal 80 to be tested, as will be explained below, is not positioned on the first receiving part 40, then the receiving parts 40 and 42 abut one another in the region of this particular circular parting plane 44.
  • the second receiving part 42 on its side facing the first receiving part 40 has a coaxial with the central axis 58 extending annular groove 60.
  • the groove 60 has a rectangular cross-section.
  • a total annular sealing device 62 is received in the groove 60.
  • the sealing means 62 seals the first receiving part 40 relative to the second embodiment 42.
  • the sealing means 62 may be formed of, for example, copper or polytetrafluoroethylene (PTFE).
  • the supply line 14 already mentioned with reference to FIG. 1, the lower end of which is shown in FIG. 2, comprises a cylindrical tube wall 64 which delimits a cylindrical inner space 66.
  • the tube wall 64 extends coaxially to the central axis 58 of the receiving device 18.
  • the tube wall 64 is connected in the region of the inlet 16 by means of a weld 68 with a substantially circular outer surface 70 of the receiving device 18.
  • the supply line 14 is connected in the region of the inlet 16 via a screw detachably connected to the second receiving part 42,
  • the pipe wall 64 of the supply line 14 extends into the second receiving part 42 with a lower end 72.
  • the pipe wall 64 and the interior space 66 open at a supply chamber 74 extending parallel to the separating plane 44, which is arranged coaxially with the central axis 58 of the receiving device 18.
  • the storage space 74 is delimited by a recess 76 which is provided on the second receiving part 42.
  • annular receiving space 78 for receiving a test, in particular annular, seal 80, which is provided for a low-temperature application, is arranged coaxially with the central axis 58.
  • the receiving space 78 is formed by a groove-shaped recess which is provided in the first receiving part 40 on the side opposite the storage space 74 side of the parting plane 44.
  • the first receiving part 40 has an annular surface 82 extending parallel to the dividing plane 44.
  • the second receiving part 42 has an annular surface 82 opposite the annular surface 84.
  • the annular surfaces 82 and 84 are slightly spaced from each other, so that a fluid-effective Verb ⁇ n tion between the reservoir 74 and the receiving space 78 is created.
  • the first receiving part 40 has a further annular surface 86 and the second receiving part 42 has a further annular surface 88.
  • the further annular surfaces 86 and 88 extend parallel to the parting plane 44 and are slightly spaced from each other, so that a fluid-effective connection between the receiving space 78 and a further radially outwardly arranged annular collecting space 90 is provided.
  • the collecting space 90 is bounded by a groove-shaped recess 92 which is provided in the second receiving part 42.
  • the collecting space 90 extends in the radial direction between the receiving space 78 and the sealing device 62.
  • the seal 80 to be tested abuts against the first receiving part 40 in the receiving space 78 with a first sealing surface 80a. With a sealing surface 81b opposite the first sealing surface, the seal 80 to be tested bears against the second receiving surface 42.
  • This provides for an axial seal.
  • the corresponding to be tested seal 80 is an axial seal.
  • a major axis of this axial seal 80 is then at least approximately concentric with the central axis 58. (In an axial seal, sealing surfaces lie transversely and in particular perpendicular to the main direction, in a radial seal sealing surfaces are at least approximately parallel to a main direction of the seal.)
  • test device according to the invention is suitable for testing axial seals.
  • the collecting space 90 communicates via a bore 94 with the leakage quantity line 22 in connection.
  • the leakage quantity line 22 is connected via a weld 96 to the outer surface 70 of the second receiving part 42.
  • the leakage quantity line 22 is not connected via a weld 96, but via a screw connection with the second receiving part 42.
  • the temperature measuring device 32 of the test apparatus 10 comprises a
  • Measuring line 98 which penetrates a holder 100 connected to the second receiving part 42 and the second FreteiJ 42 and opens with a measuring head 102 in the reservoir 74.
  • the holder 100 is connected via a weld 104 to the outer surface 70 of the second receiving part 42.
  • the measuring device 32 is connected to the second receiving part 42 by means of a screw connection.
  • the test apparatus 10 works as follows.
  • the receiving parts 40 and 42 are not yet connected to each other by means of the connecting device 46.
  • the receiving space 78 of the first receiving part 40 is accessible, so that the seal to be tested 80 in the receiving space 78 can be inserted.
  • the second Constei! 42 placed on the first receiving part 40, so that the bores 48 and 50 of the receiving parts 40 and 42 are aligned with each other and the receiving parts 40 and 42 can be connected to each other by means of the connecting means 46.
  • the connecting devices 46 can be subjected to a specific torque for setting a specific axial force. This torque can be adapted to the installation conditions in the later use of the seal to be tested.
  • the container interior 38 of the container 28 can be filled with the preferably liquid cooling medium 30.
  • the receiving device 18 prepared as described above can then be immersed in the cooling medium 30.
  • test fluid with a test pressure, for example, an overpressure of up to 1000 bar, are acted upon.
  • the test fluid can be supplied to the reservoir 74 via the supply line 14. From the reservoir 74, the test fluid passes into the receiving space 78 by flowing radially outward from the space defined by the annular surfaces 82 and 84.
  • the seal 80 arranged in the receiving space 78 prevents, at least for the most part, a flow of the test fluid which extends beyond the receiving space 78 and is directed radially outward. However, it may be that a leakage amount of the test fluid beyond the seal 80 penetrates into the collecting space 90 through the space formed between the other annular surfaces 86 and 88. From there, the leakage quantity can be supplied to the measuring device 24 via the bore 94 and the leakage quantity line 22. The measuring device can determine the volume and / or the volumetric flow and / or the mass and / or the mass flow of the leakage quantity of the test fluid.
  • the supply device 12 can be operated such that the test fluid, which is supplied to the storage space 74 of the receiving device 18, is kept under a constant pressure. This prevents the leakage of the leakage amount of the test fluid from the receiving device 18 to the measuring device 24 resulting in a pressure drop in the reservoir 74 and in the receiving space 78.
  • the temperature of the test fluid present in the reservoir 74 is measured with the aid of the temperature measuring device 32. The pressure difference between the inlet 16 and the outlet 20 is constant, ie does not change.
  • the sealing device 62 With the aid of the sealing device 62, it is prevented that the leakage quantity of the test fluid does not flow out of the receiving device 18 via the leakage quantity gauge 22, but rather radially outwards in the region of the parting plane 44. In a corresponding manner, the entry of cooling medium 30 into the collecting space 90 is prevented with the aid of the sealing device 62.
  • a receiving device 106 shown in FIG. 3 has a construction similar to the receiving device 18 described above with reference to FIG. 2.
  • the receiving device 106 in contrast to the exceänraum 18 of the inlet 16, via which the supply line 14 is in communication with the receiving device 106, disposed radially outward.
  • the outlet 20, which is connected to the leakage line 22 is arranged in the region of the central axis 58 of the receiving device 106.
  • the arrangement of the storage space 74 and the collecting space 90 is reversed so that the collecting space 90 is located radially inward and the storage space 74 is arranged radially outside of the receiving space 78.
  • a test of a seal 80 to be tested with half of the receiving device 106 is carried out as described above with reference to the receiving device 18.
  • a vacuum in the reservoir 74 of one of the receiving devices 18, 106 is generated. If a seal 80 to be tested does not seal 100% of the receiving space 78 relative to the collecting space 90 which adjoins in the radial direction outwards (FIG. 2) or inwardly (FIG. 3), then it can communicate with the collecting space 90 standing line 14 a leakage amount of test fluid are sucked. The volume and / or the volume flow and / or the mass and / or the mass flow of this leakage quantity can be determined with the aid of the measuring device 24.

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Abstract

L'invention concerne un dispositif de test d'un joint d'étanchéité prévu pour des applications à basse température, qui présente un dispositif de réception qui présente un espace de réception qui reçoit un joint d'étanchéité à tester, un dispositif d'alimentation qui communique hydrauliquement avec l'espace de réception et qui alimente l'espace de réception en fluide de test, un dispositif de mesure qui détermine le volume et/ou le débit volumique et/ou la masse et/ou le débit massique d'une fuite de liquide de test et qui communique hydrauliquement avec l'espace de réception, et un dispositif de refroidissement qui refroidit le dispositif de réception.
PCT/EP2008/059063 2007-07-13 2008-07-11 Dispositif et procédé de test d'un joint d'étanchéité prévu pour des applications à basse température Ceased WO2009010458A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007032761A DE102007032761A1 (de) 2007-07-13 2007-07-13 Prüfvorrichtung und Verfahren zur Prüfung einer für eine Tieftemperaturanwendung vorgesehenen Dichtung
DE102007032761.9 2007-07-13

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WO2009010458A2 true WO2009010458A2 (fr) 2009-01-22
WO2009010458A3 WO2009010458A3 (fr) 2009-04-02

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DE (1) DE102007032761A1 (fr)
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DE102022133915A1 (de) 2022-12-19 2024-06-20 Audi Aktiengesellschaft Prüfvorrichtung mit einem Prüfkörper

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* Cited by examiner, † Cited by third party
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CN113029552A (zh) * 2021-04-28 2021-06-25 北京裕泰行新材料科技有限公司 一种低温用密封圈的性能测试装置、测试系统及测试方法
CN113029552B (zh) * 2021-04-28 2024-04-19 北京裕泰行新材料科技有限公司 一种低温用密封圈的性能测试装置、测试系统及测试方法

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WO2009010458A3 (fr) 2009-04-02

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